Strategies for Mitigating Torque Ripple in Interior Permanent Magnet Synchronous Motors Based on Current Compensation

Abstract

In this article, the aim is to investigate the torque ripple and propose control strategies to reduce the torque ripple in Interior Permanent Magnet Synchronous Machine (IPMSM). Frequently, zero current in dx-axis is used to reduce the effect of reluctance torque. This is unsuitable for the IPMSM, due to the cross-coupling effect between the qx- and dx-axis. In order to overcome the cross-coupling effect problem, firstly, a novel modeling of reluctance torque is proposed, which allows the elaboration of control strategies by injecting current either in the qx-axis to suppress the effects of the cogging torque or in the dx-axis, to nullify the reluctance torque together with the cogging torque or just the reluctance torque. For this purpose, machine parameters and a pre-made lookup table are necessary. The results demonstrated the effectiveness of each strategy. The torque ripple can be totally or partially reduced according to the chosen strategy. The strategies have different current values, consequently, the copper losses in the machine will be different, as shown and discussed in the paper.

Keywords:

• IPMSM
• finite element analysis (FEA)
• reluctance torque
• torque ripple
• vector control

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

C. Filho

Celio Filho received the B.S. degree in Electrical Engineering from Federal Institute of Education, Science and Technology of Goiás, Goiânia, Brazil, in 2013 and the M.S. degree in Electrical Engineering from the Federal University of Goiás, Goiânia, Brazil, in 2019. Nowadays, he is a doctoral student in electrical engineering at the Federal University of Goiás, Goiânia, Brazil. His research interests include electrical machines, the finite element method, permanent magnet machines, and power electronics.

G. Paula

Geyverson Paula received the B.S., M.S. and Ph.D in Electrical Engineering from the University of São Paulo, São Carlos, Brazil, in 2011, 2013, and 2016, respectively. Nowadays, he is professor and researcher in electrical engineering at the Federal University of Goiás, Goiânia, Brazil. His research interests include electrical machines, the finite element method, permanent magnet machines, and power electronics.

B. Alvarenga

Bernardo Alvarenga received the B.S. degree in Electrical Engineering from the University of Brasília, Brasília, Brazil, in 1990, the M.S. degree in Electrical Engineering from the Federal University of Uberlandia, Uberlandia, in 1993, and Ph.D in Electrical Engineering from the University of São Paulo, Brazil, in 2004. Nowadays, he is professor and researcher in electrical engineering at the Federal University of Goiás, Goiânia, Brazil. His research interests include power electronics and electrical machines.